THE PARALLEL ROADS OF GLEN HOY. 155 
will then be transformed into a dry precipice, forming a 
simple continuation of the cliffy boundary of the Niagara 
gorge. At the place occupied by the fall at this moment 
we shall have the gorge enclosing a right angle, a second 
whirlpool being the consequence. To those who visit 
Niagara a few millenniums hence I leave the verification 
of this prediction. All that can be said is, that if the 
causes now in action continue to act, it will prove itself 
literally true 
POSTSCBIPT. 
A year or so after I had quitted the United States, a 
man sixty years of age, while engaged in painting one of 
the bridges which connect Goat Island with the Three 
Sisters, slipped through the rails of the bridge into the 
rapids, and was carried impetuously toward the Horseshoe 
Fall. He was urged against a rock which rose above the 
water, and with the grasp of desperation he clung to it. 
The population of the village of Niagara Falls was soon 
upon the island, and ropes were brought, but there was 
none to use them. In the midst of the excitement, a tall 
powerful young fellow was observed making his way silently 
through the crowd. He reached a rope; selected from 
the bystanders a number of men, and placed one end of 
the rope in their hands. The other end he fastened round 
himself, and choosing a point considerably above that to 
which the man clung, he plunged into the rapids. He 
was carried violently downward, but he caught the rocE, 
secured the old painter and saved him. Newspapers from 
all parts of the Union poured in upon me, describing this 
gallant act of my guide Conroy. 
CHAPTEK VIII. 
THE PARALLEL ROADS OF GLEN ROY.* 
THE FIRST published allusion to the Parallel Roads of 
Glen Roy occurs in the appendix to the third volume of 
Pennant's " Tour in Scotland," a work published in 1776. 
* A discourse delivered at the Royal Institution of Great Britain on 
June 9, 1876. 
